Adjust copyrights years

<?php
/**
 * SeekQuarry/Yioop --
 * Open Source Pure PHP Search Engine, Crawler, and Indexer
 *
 * Copyright (C) 2009 - 2018  Chris Pollett chris@pollett.org
 *
 * LICENSE:
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * END LICENSE
 *
 * Test to see how many sockets system can open. On *nix systems, by doing
 * ulimit -n
 * you can find this out,
 * but the number doesn't exactly agree.
 *
 * On Macs (up till Lion) you can change this value by editing /etc/launchd.conf
 * and having lines like (for most recent Macs should search around for
 * analogous commands):
 *
 * <pre>
 * limit maxproc 1024 2048
 * limit maxfiles 2048 2048
 * </pre>
 *
 * @author Chris Pollett chris@pollett.org
 * @license https://www.gnu.org/licenses/ GPL3
 * @link https://www.seekquarry.com/
 * @copyright 2009 - 2018
 * @filesource
 */
namespace seekquarry\yioop\tests;

if (isset($_SERVER['DOCUMENT_ROOT']) && strlen($_SERVER['DOCUMENT_ROOT']) > 0) {
    echo "BAD REQUEST";
    exit();
}
ini_set("memory_limit", "100M");
$begin_mem = memory_get_usage();
for ($i = 0; $i < 10000; $i++) {
    $socket[$i] = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
    $address = "127.0.0.1";
    $port = 80;
    $val = socket_connect($socket[$i], $address, $port);
    if ($val) {
        echo "connection established\n";
        echo "Memory used for connection up to $i: ".
            (memory_get_usage() - $begin_mem)." bytes\n";
    }
}
for ($j = 0; $j <= $i; $j++) {
    socket_close($socket[$j]);
}